Abstract: A thermoplastic material composite panel, comprising a transparent thermoplastic base layer, light conducting, having a thickness generally in the range 3-40 mm, and a light diffusing layer, having a thickness generally in the range 10-1500 micron, placed on one face of the base layer, said diffusing layer being characterized in that it contains barium sulphate in amount by weight, expressed as per cent ratio on the total weight of the diffusing layer, in the range 0.01-2%, the barium sulphate having average particle sizes in the range 0.1-50 micron, the composite sizes being-greater than or equal to 10 cm.

Abstract: The thermoplastic composition according to the invention for shaped light-scattering articles, based on a transparent thermoplastic formed from (meth)acrylic (co)polymer and on light-scattering particles, comprises polytetrafluoroethylene (PTFE) particles or a mixture of PTFE particles and particles of a mineral and/or organic substance, these light-scattering particles having a mean size of 0.5 &mgr;m to 200 &mgr;m and a refractive index which differs from that of the transparent thermoplastic by at least ±0.05 and being used in an amount, with respect to the total composition, of 5 ppm to 2000 ppm by weight. Application to light display devices and to flat light screens comprising a sheet obtained from the composition.

Abstract: The thermoplastic composition according to the invention for shaped light-scattering articles, based on a transparent thermoplastic formed from (meth)acrylic (co)polymer and on light-scattering particles, comprises polytetrafluoroethylene (PTFE) particles or a mixture of PTFE particles and particles of a mineral and/or organic substance, these light-scattering particles having a mean size of 0.5 &mgr;m to 200 &mgr;m and a refractive index which differs from that of the transparent thermoplastic by at least ±0.05 and being used in an amount, with respect to the total composition, of 5 ppm to 2000 ppm by weight.

Abstract: Antinoise and flame-resistant barriers formed by supports and by sheets fixed thereon, characterized by the fact that the sheets consist of a methylmethacrylate copolymer and acrylic acid comprised between 1 and 20% by weight.

Abstract: Multilayer transparent, antireflex, coloured or opaline plates, with smooth or embossed surfaces, optionally thermouldable with external layers in acrylic polymers, low thickness, in the range of 1.5 up to lower thicknesses of 10 mm, by employing one or more polymeric continuous films which have the property to have elastic modulus lower than the one of PMMA of at least 30%, and/or elongation at break higher than at least 40%, measured by the test according to ISO 527 for plates or films, placed inside the panel.

Abstract: Antinoise and antifragmentation plates based on acrylic polymers employing a polymeric continuous film placed inside the plate, wherein the film is characterized by an elastic modulus lower than the one of PMMA of at least 30%, and/or elongtion at break higher than at least 40%, measured by the test according to ISO 527 standard for plates or for films.

Abstract: Antinoise and antifragmentation plates based on acrylic polymers containing filaments of plastic material placed at a distance comprised between 20 and 35% of the thickness with respect to the surface opposite to impact.